648653817 has 32 divisors (see below), whose sum is σ = 1043424000. Its totient is φ = 357861504.

The previous prime is 648653813. The next prime is 648653851. The reversal of 648653817 is 718356846.

It is not a de Polignac number, because 648653817 - 2² = 648653813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (648653813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18973 + ... + 40709.

It is an arithmetic number, because the mean of its divisors is an integer number (32607000).

Almost surely, 2^648653817 is an apocalyptic number.

It is an amenable number.

648653817 is a deficient number, since it is larger than the sum of its proper divisors (394770183).

648653817 is a wasteful number, since it uses less digits than its factorization.

648653817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21790 (or 21776 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 648653817 is about 25468.6830637157. The cubic root of 648653817 is about 865.6406836415.

The spelling of 648653817 in words is "six hundred forty-eight million, six hundred fifty-three thousand, eight hundred seventeen".